Tag: chemistry

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Multiple choice chemistry metals and non metals refining of metals basics of metallurgy basic metallurgical processes

On the basis of following features identify the correct option:
I. This metal is not obtained in free state.
II. This metal is obtained by electrolysis of their chlorides in molten state.

  1. $Na$
  2. $Ca$

  3. both (1) and (2)

  4. neither (1) nor (2)
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

Both Sodium and calcium are highly reactive metal oxides are not reduced by carbon and these metals are obtained in free state by electrolytic reduction of their molten chloride salts.

Multiple choice chemistry metals and non metals refining of metals basics of metallurgy basic metallurgical processes

In electrolytic refining, which one is the anode and which is cathode?

  1. Pure metal is the anode and impure metal is cathode

  2. Impure metal is made anode and pure metal cathode

  3. Both can be done interchangeably

  4. None of the above
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

In electrolytic refining, impure metal is made the anode and a thin strip of pure metal is made the cathode.

Multiple choice chemistry metals and non metals refining of metals basics of metallurgy basic metallurgical processes

Impurities present at anode are deposited at the bottom and called as _______.

  1. anode dust

  2. anode particulate

  3. anode mud

  4. anode impurities
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

In the electrolytic refining the process the impure sample is used as anode and pure metal is obtained at cathode. Impurities present at anode are deposited at the bottom and called as anode mud.

Multiple choice chemistry production of metals refining of metals basics of metallurgy basic metallurgical processes

During extraction of metals, electrolytic refining is used to obtain pure metals. Material which will be used as anode, for refining of silver metal by this process, is:

  1. zinc

  2. impure silver

  3. pure silver

  4. iron
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

Electrolysis is the dissolving of metal from one electrode of an electrolytic cell to another electrode in pure form. It gives the highest purity metal product. The impure silver is cast into a slab which is the anode, while pure silver sheet metal is the cathode.

Multiple choice chemistry production of metals refining of metals basics of metallurgy basic metallurgical processes

Sodium is obtained by the electrolysis of:

  1. an aqueous solution of sodium chloride

  2. an aqueous solution of sodium hydroxide

  3. fused sodium chloride

  4. fused sodium sulphate
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

Sodium is obtained by the electrolysis of fused mixture of $NaCl$ and $CaCl _2$ (Down's process). Reaction can be written as:

$2NaCl \rightarrow 2Na + {Cl} _2$